Foldable pillow



FIG. 1 is a top, front, left side perspective view of a foldable pillow embodying my new design;

FIG. 2 is a bottom plan view thereof, the top plan view being a mirror image thereof;

FIG. 3 is a front elevational view thereof, the rear elevational view being a mirror image thereof; and,

FIG. 4 is a right side elevational view thereof, the left side elevational view being a mirror image thereof. 

The ornamental design for a foldable pillow, as shown and described. 